Add statement about local.storage.uuid presence in agent.properties (#473)

Author: harikrishna-patnala

source/adminguide/storage.rst

@@ -164,8 +164,9 @@ In order to use multiple local storage pools, you need to
 
 #. Edit /etc/cloudstack/agent/agent.properties
 
-    - Add extra directories to "local.storage.path"
-    - Add UUID of directories to "local.storage.uuid" (UUID can be generated by `uuidgen`)
+    - Add extra directories to "local.storage.path".
+    - Add UUID of directories to "local.storage.uuid" (UUID can be generated by `uuidgen`).
+      "local.storage.uuid" must be present in the agent.properties file and should not be deleted.
 
     .. parsed-literal::